package cn.tedu._05weibo.interceptors;

import cn.tedu._05weibo.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;
import net.bytebuddy.asm.Advice;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@Slf4j
public class UserLoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        /**
         * 1登录状态的校验
         *  1.未登录状态"跳转到登录页面;
         *  2.登录状态:放行 retuen true;
         * 2.实现知识点
         *  2.1获取回话对象:
         */
        log.debug("spring MVC拦截器进行登录状态矫正");
        HttpSession session=request.getSession();
        UserVO userVO=(UserVO) session.getAttribute("user");
        if (userVO==null){
            response.sendRedirect("/login.html");
            return false;
        }
        return true;

    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
